Research Article
Title Fault Diagnosis Method of Gearbox Multifeature Fusion Based on Quadratic Filter and QPSO-KELM
Table 1
Main dimensions of bearing ER-16K.
| Number of rolling elements Nb | Ball diameter d (inch) | Pitch diameter D (inch) | Contact angle θ (°) |
| 9 | 0.3125 | 1.516 | 0 |
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